I once worked under a CTO who remarked "it's not like we're going to hire a woman" after interviewing a female dev candidate, which would be horribly offensive even if he was just kidding (he wasn't kidding, I was shocked he even took the time to interview her).
There's definitely a sense of "startups are the new banking." It's frustrating because there are also a lot of good people, but man is there a glut of bros who fit all the worst stereotypes of old boys club business.